Computer Science • Data Representation & Compression
Pixel Painter
A digital transmission needs to be reconstructed! Compress each row of the target graphic into Run-Length Encoding (RLE) counts and color codes (e.g., 3W 15B) to paint the image line-by-line before the timer runs out.
Learning objectiveData compression · RLE algorithm
Understand and execute Lossless Data Compression using Run-Length Encoding (RLE) on binary and multi-color raster graphics.
By the end of a round you should be able to: identify consecutive runs of identical pixels; convert pixel runs into count-and-code pairs; recognize how RLE significantly reduces file sizes for simple images; and calculate row-by-row compressed representations accurately under time pressure.
- Look at the highlighted row on the target image (left grid).
- Count consecutive runs of matching colors from left to right across the row.
- Enter the run length (1 or 2 digits) followed by the color letter (W, B, R, G). The color letter terminates the run count (e.g., enter 3 then W, then 15 then B for 3W 15B).
- Once all pixels for a row are encoded, the row automatically paints to your canvas!
- Mistakes trigger a time penalty (-5s) — check your counts carefully.
- Finish as many sprites as you can before the 60-second timer expires!
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